I have a lot of squirrels in my yard, They love to tease my poodle, MOlly. This is the reason she learned that she can climb the fence. I also have a neutered white siamese who decided that he lives here(outside).

If your do some research you should find that the is a contraption that you can put over the entrance where the are coming into the attic. It looks like a cone the the pointed part facing out. They can leave but they can't get back in. Squirrels that is.

Here in town we of course have a lot of Squirrels, and one of them is sorta strange. For a long time I've found nuts hidden under leaves in my pot plants (not THAT kind of pot plants) and sometimes I stand out front and watch her (mentally a blonde?)
lay a nut on the ground and cover it with leaves. She'll study it and then move the leaves and rush off to find different ones. I have to keep pulling stray nut seedlings up from the planter beds. And in the notch of the front door tree is one nut that now has a leaf over it, replaced as soon as it blows away.
Also outside is a land turtle, now safely dug in for hibernation.
Inside are two rescue cats, and of course no mice have been around for years.
One male cat outside who comes around to pee on my front screen door. Sometimes dogs wonder around but in this town very few are let run loose.